The MAA was signed in 1969 by Canada and the governments of Alberta, Saskatchewan, and Manitoba in recognition of the need to cooperatively share and manage interprovincial waters for the benefit of present and future generations.

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PPWB Water Quality Agreement

In 1969, the governments of Alberta, Saskatchewan, Manitoba and Canada signed the Master Agreement on Apportionment (MAA). The initial purpose of the MAA was to provide for the sharing of water in eastward flowing streams that cross interprovincial boundaries and establish the PPWB board to oversee the Agreement. While the authors of the MAA were primarily concerned with water quantity, they also recognized the potential importance of water quality. The original MAA stated that interprovincial water quality problems are to be referred to the Board for consideration. In 1992, the MAA was amended to include the Agreement on Water Quality (Schedule E) that provided a framework on how to protect water quality. The Agreement defines the water quality mandate of the Board in interprovincial watercourses: the Board shall "foster and facilitate interprovincial water quality management among the parties that encourages the protection and restoration of the aquatic environment".

Schedule E established water quality objectives for 12 PPWB eastward transboundary rivers.The objectives are descriptions of water quality conditions that are known to protect human and ecological health, and are acceptable to upstream and downstream provinces. PPWB member agencies have agreed to endeavour to meet these objectives. This cooperative approach will ensure that the water remains fit for both current and future uses, including use by people, aquatic life, consumers of aquatic life, and agriculture.

From Schedule E, the water quality duties of the PPWB Board are to:

monitor the quality of the aquatic environment in the river reaches and make comparisons with the PPWB objectives;

review the appropriateness of the PPWB objectives;

provide written reports on the quality of water in interprovincial river reaches and on water quality issues;

promote the establishment of compatible water quality objectives in the Prairie provinces;

promote a preventive and proactive ecosystem approach to interprovincial water quality management; and

promote the recognition of the interdependence of quality and quantity of water in the management of watercourses.

Over the years the PPWB has developed an active water quality program to assess whether PPWB objectives have been met. This program includes Environment Canada monitoring the water quality at 12 PPWB monitoring stations although only 11 of them have current PPWB objectives.

In recent years, the PPWB has worked towards an integrated ecosystem and watershed approaches in dealing with environmental issues. Complementing these approaches is the recent adoption by the federal-provincial Canadian Council of Ministers of Environment (CCME) of the source to tap, multi-barrier approach to protecting drinking water for Canadians. The multi-barrier approach highlights the importance of protecting the lakes, rivers and aquifers which are the sources of our drinking water, as well as ensuring effective treatment and distribution systems.

The PPWB supports the multi-barrier approach, and its agencies are committed to identifying, understanding and reducing the human and environmental impacts of micro-biological and chemical substances which contaminate water sources and aquatic ecosystems. All board agencies share the knowledge of the threats to water quality, strategies to reduce or eliminate the impacts and information on water quality issues and trends in ecosystem health